OBJECTIVE To study the pharmacokinetics of PLGA-gemcitabine sustained-release microspheres in nude mice with pancreatic cancer, to provide evidence of theories and experiments for its clinical application. METHODS Plasma, tumors, livers and kidneys were obtained after nude mice with pancreatic cancer received interstitial chemotherapy by PLGA-gemcitabine microspheres (A, 8.64 mg·kg-1), systemic chemotherapy (B, 8.64 mg·kg-1) and tumor regional chemotherapy (C, 8.64 mg·kg-1) by gemcitabine, respectively. Gemcitabine concentrations in plasma and tissues were measured using HPLC, the pharmacokinetic parameters were calculated by WinNolin 4.0.1 software, and t-test was used for statistical analysis. RESULTS The pharmacokinetic parameters of gemcitabine in mice plasma were as follows: ρmax (0.18±0.06), (1.765±0.329) and (0.127±0.042)mg·L-1 (A vs B, P<0.05); t1/2(120±10.6), (4.28±1.07) and (6.32±1.25) h; tmax (72±2.5), (0.33±0.09) and (0.50±0.21)h; MRT (56.8±10.9), (0.43±0.14) and (0.19±0.04) h; AUC (10.2±2.7), (0.13±0.03) and (0.56±0.18) mg·h·L-1 in group A, B and C. The pharmacokinetic parameters of gemcitabine in mice tumor were as follows: ρmax (1.329±0.381), (0.462±0.150) and (0.753±0.166) mg·L-1 (A vs B and C, P<0.05); t1/2 (97.39±8.93), (5.97±1.65) and (2.15±0.58) h; tmax (24±3.2), (4.0±1.2) and (0.00±0.02) h; MRT (399.8±20.8), (126.9±15.4) and (117.8±10.7) h; AUC (383.7±25.2), (56.83±6.73) and (71.60±18.52) mg·h·L-1. The pharmacokinetic parameters of gemcitabine in mice livers were as follows: ρmax (0.734±0.152), (0.578±0.083) and (0.85±0.19) mg·L-1 (A vs B, C, P>0.05); tmax (72±6.2), (24±3.9) and (72±4.5) h; MRT (520.5±20.2), (111.7±19.4) and (112.9±9.6) h; AUC (1 325.9±86.5), (216.4±32.6) and (108.8±29.1) mg·h·L-1. The pharmacokinetic parameters of gemcitabine in mice kidneys were as follows: ρmax (0.55±0.16), (0.458±0.137) and (0.687±0.232 )mg·L-1(A vs B, C, P>0.05); tmax (2.0±0.6), (8.0±2.3) and (120±10.4) h; MRT (462.1±28.6), (111.1±20.1) and (119.6±18.6) h; AUC (378.1±38.5), (29.42±10.64) and (97.57±16.72) mg·h·L-1. CONCLUSION Gemcitabine concentrations were significantly increased, action time was prolonged and toxicities were decreased after interstitial chemotherapy by PLGA-gemcitabine microsphere.
YNG Mei;LI Jing-qun;TNG Zhi-qing;ZHO Ping.
Study on Pharmacokinetics of PLGA-Gemcitabine Sustained-Release Microspheres in Nude Mice with Pancreatic Cancer[J]. Chinese Pharmaceutical Journal, 2010, 45(4): 295-298
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